Method and apparatus for treating ammonia-containing effluent

Details Method and apparatus for treating ammonia-containing effluent Method and apparatus for treating ammonia-containing effluent

C - Chemistry, Metallurgy

02

F

C02F 1/20 (2006.01) B01D 53/86 (2006.01)

Patent

CA 2418390

A method for treating an NH3-containing effluent water which comprises contacting an NH3-containing effluent water (A) with a carrier gas (steam C and a combustion gas F) in a stripping tower (7), to thereby transfer NH3 from the effluent water to a gas phase, heating the resultant NH3-containing gas by means of a preheater (19), and contacting the heated gas with a catalyst layer (13) in a catalyst tower (12), to thereby decompose the NH3 into nitrogen and water, wherein the concentrations of oxygen and N2O in the catalyst tower (12) are measured with measuring instruments (21) and (22) respectively and the oxygen concentration in the gas introduced to the catalyst tower (12) is controlled by a control valve (17) so as for the N2O concentration to be fallen within a given range.

L'invention concerne un procédé pour le traitement d'effluents contenant du NH¿3?, qui consiste à mettre en contact ces effluents (A) avec un gaz vecteur (vapeur C et gaz de combustion F) dans une tour de stripping (7), pour engager le transfert de NH¿3? en phase gazeuse; à chauffer le gaz à base de NH¿3? résultant au moyen d'une unité de préchauffage (19); et à mettre en contact le gaz chauffé avec une couche de catalyseur (13) dans une tour catalytique (12), pour la décomposition de NH¿3? en azote et eau. Les concentrations d'oxygène et de N¿2?O dans la tour catalytique (12) sont respectivement mesurées au moyen des instruments de mesure (21) et (22), et la concentration d'oxygène du gaz injecté dans la tour catalytique est contrôlée au moyen d'une valve de régulation (17), ce qui permet de faire descendre la concentration de NO¿2? dans une fourchette donnée.

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